initial commit. phase 1 complete

frontend/node_modules/@panva/hkdf/dist/node/esm/runtime/fallback.js

@@ -0,0 +1,21 @@
+import { createHmac } from 'crypto';
+export default (digest, ikm, salt, info, keylen) => {
+    const hashlen = parseInt(digest.substr(3), 10) >> 3 || 20;
+    const prk = createHmac(digest, salt.byteLength ? salt : new Uint8Array(hashlen))
+        .update(ikm)
+        .digest();
+    const N = Math.ceil(keylen / hashlen);
+    const T = new Uint8Array(hashlen * N + info.byteLength + 1);
+    let prev = 0;
+    let start = 0;
+    for (let c = 1; c <= N; c++) {
+        T.set(info, start);
+        T[start + info.byteLength] = c;
+        T.set(createHmac(digest, prk)
+            .update(T.subarray(prev, start + info.byteLength + 1))
+            .digest(), start);
+        prev = start;
+        start += hashlen;
+    }
+    return T.slice(0, keylen);
+};

frontend/node_modules/@panva/hkdf/dist/node/esm/runtime/hkdf.js

@@ -0,0 +1,14 @@
+import * as crypto from 'crypto';
+import fallback from './fallback.js';
+let hkdf;
+if (typeof crypto.hkdf === 'function' && !process.versions.electron) {
+    hkdf = async (...args) => new Promise((resolve, reject) => {
+        crypto.hkdf(...args, (err, arrayBuffer) => {
+            if (err)
+                reject(err);
+            else
+                resolve(new Uint8Array(arrayBuffer));
+        });
+    });
+}
+export default async (digest, ikm, salt, info, keylen) => (hkdf || fallback)(digest, ikm, salt, info, keylen);